Link chain



Nov. 22, 1927. 1,649,956

F. HANNAN LINK CHAIN 3 Sheets-Sheet l 3 Sheets-Sheet 2,

Nov. 22, 1927.

. F. HANNAN LINK CHAIN Filed April 15. 1926 Nov. 22, 1927.

F. HANNAN LINK CHAIN 3 Sheets-Sheet 3 Filed April -1926 H ilmma flue" showing the supporting frame;

Patented Nov. 22, 1927. V

UNITED STATES P TE T oF-ricE-Q r-rmnunrex HANNAN', or nun-nnn-srmnn; ENGLAND p Y LINK, CHAIN.

I Application filed A ril} 15, 1926, 'sma jno. 102,354, and in Great Britain April, 6, 1925: t

This invention. comprises certain improvements in'link chains and travelling grates for steam. boilers or the like;

According to the preseiit improvements, the

links are adapted .to have a lateral pivotal movement in relation to one another, whilst" have. a pivotal movement, in relation to one.

another, abouta transverse axis oran angular pivotal movement. The links are,'in the hereafter described embodiment, formed in a chain by merely hooking the links together, cannot normally'become detached or move longitudinally in relation to one another when the chain is in use or in an operative position. The hook and eye elements also form the pivot elements. By this invention also, an improved arrangement of chain is obtained. 2

Referring to the drawings: Figure 1 is a plan view of a link constructed according to this invention.

Figure 2 is a section on line mm oflfigure 1. r

Figure 3 is a side elevation. Figure 4 is an underside view of the link shown by'Figures l and'2. Figure 5 is a plan view of a modified form of link. i 1

Figure 6 is a section on line-w w of Figure 4;

Figure 7 is a sectional plan view-ofa boiler" constructed accordingtothis invention, the left' hand flue showing one chain, grate in position, whilst the return. portion of the other chain only is shown, and the other Figure 8 isan' elevation showing oneflue in sectionon line a a of Flgurel;

Figure 9 is a side elevation of the 1 side bracket. I I

According to one form'of this invention,

each link comprises a head 1 having-a converc outer side 2 and a concave nner side 3 ofthe same curvature, in =-order that a series of heads can nest together, and in order that the'heads may slide laterally in relation to one another. Two arms of a looped mam her 4 project from the sides of this head on the concave side, such arms first depending slightly below the head, and afterwards lying in a plane parallel to the plane of the head. A tongue or L-shaped member 5,

shaped member 5 in such a "manner that the links p p tion to follow any path, themembers 5' and axis, when passing aforedescribed applied to, the travelling @grate. of a-Lancashireboiler; The chain is:;.

which is curved at the bend, depends down Wardly from the centre of the head at: the, said concave, side] The ceutre of, the vertical limb ,5 of this :L-lshaped member' lies at the-centre of curvature of the convex side? of the said loop liesatthe'centre of'cu-r'va-' ture of'the concave side 3 of the headmTh'e horizontal oriin'turned p'ortionb" of the L shaped arm lies below the plane'xof the said looped member. When" therefore the is engaged in the loopof the" next adjacent link,- it will be' see'i'r that thelinks are flexible-in a lateral direcloops 4 forming pivotalmembers. As the" heads of the links; abut against" one another,

longitudinal movement inrelation toone an"- The L-shaped' mei'nb'erscan also pivot on the looped members to allow the links to-pivoti in relation to one another about: a transverse around a: drum orother curved surface.

can readily be adapted fora variety ofcuses.

Figures 7 to 9 illustrate a chain of links mounted on suitable pulleys orguide'rollers, andthe chain passeslongitudinally from; the front of the furnace to the rear,.then back;

to. the front and; then back'again to'the rear- 100 of the furnace, the chain passing over pulleys .at the 'rear' and front of thefurnace and under the grate to form a continuous chain, Two chain grates are mounted n' each flue. 'Ea'ch'chain passes round a guide 1 block 6 at the rear of the flue and the guide block 7 at the front'of-fthe flue and'each chain gratealso passes and meshes round a pulley 8 and back under the grate to. mesh the pulley 9 the front of thefiue. The 110 i of the head, whilst the centre'of curvature 23f A-curvedslbt 25 may berg formed vertically through the headof the:

return portion of the chain grate is guided from and to the pulleys 8 and 9 by the guide blocks 10. The pulleys 9 are mounted on the driving shaft 11 which is driven by Way of the cone pulley 12 and the gear box 13. The recesses 8*"- receive the bottom of the members 1. The chain grates pass under the hopper 14 and feed the fuel into the furnace. The ash is received on a dumping plate 15 and is pushed thereup into a suitable receptacle or recess by the ashes leaving the grate. The chain grate is adjusted by mounting the guide blocks 8 in tension blocks 16 which are adjusted by means of the tension screw 17. The links of the chain,

' being constructed as aforedescribed, enables the links to pass round a curved path of small radius and consequently the longitudinal runs of the chain grate are located close together, and the space between each longitudinal run is closed by fire bars 18. These fire bars 18 are detachably mounted in the supports 19 carried by transverse'members 20 which are fixed to the longitudinal members or side brackets 21. The supporting framework thus formed is carried at the rear'by the frame 22. The guide blocks are also mounted on the transverse members 20.

' A regulating plate 22 is slidably mounted to adjust the height of opening above the chain and thereby adjust the quantity of fuel carried forward by the chain.

The fire grate is thus formed by two chains which each form three parallel runs or: rows of links and each adjacent run of.

links travel in opposite directions. The green coal thus travels rearwardly on the longitudinal run a and is ignited by the burning fuel moving forwardly on the lon gitudinal run I). The surfaceof the chain grate slopes to the back of the boiler as shown by Figure 9. passed up through the grate' By this invention therefore a continuous and regular supply of fuel is fed into the furnace. An even heatis also obtained and complete combustion of the fuelg I claim:

1. A chain link comprising a head havso that the links of a chain of such links can pivot about a. vertical axis and retain a continuous surface, and also pivotabout a A forced draught is ing a convex curved outer side and a con passing over a pulley or a convex outer side and a concave inner side, 7

a depending hook shaped member the vertical stem of'which lies concentric with the concave outer face, and. a depending looped extension to form a pivot. member to pivot about an axis concentric with the said inner concave edge. I V H 4. A continuous chain of links in which each link comprises a head having a convex curved outer side and a concave curved inner side, a looped depending extension and a depending hook shaped member both formed solid with the head so that the links of a chain of such links can pivot about a vertical axis to retain a continuous surface and also pivot about atransverse ax1s,-wh1ch chain passes substantially horizontally for-' wardly and backward to form three parallel runs, guide blocks around which the link chain passes, a pulley at one end over which the link chain passes to direct the return portion of the chain, and a pulley at the other end over which the return" portion of the chain passes.

5. A continuous chain of links in which each l nk comprises a head having a convex V curved outer side and a concave curved'inner side, a looped depending extension and a depending hook shaped member both formed solid with the head, so that the links of a chain of such link-s can pivot, about a vertical axis to retain a continuous surface and also pivot about atransverse axis, which chain passes substantially horizontally forwardly and backwardly to form three paral-' lel runs, guide blocks around which the-link chaln passes, a outer and lnner run of chains, and a pulley at each end over which the link chain passes.

In witness whereof I have signed this specification.

stationary bar bet-ween each FREDERICK ,HANNA Q 

